The wordy wine snob portrayed by Paul Giamatti in the movie "Sideways" probably could have expounded on this fact at length, but for those of us who think of fine wine as anything that doesn't come with a screw top, it probably comes as a surprise. You can make white wine from red grapes. Champagne, for example, is made from pinot noir and pinot meunier grapes (both red grapes) as well as chardonnay, and the three types of grapes are often blended.
All grape juice, which comes from the inside of the grapes, starts out as white. It's the skin that contains the red pigment. If the juice is squeezed out of the grapes and separated quickly from the skins, it remains white. By contrast, if winemakers are producing a red wine, they allow the juice to remain in contact with the red skins during fermentation. This causes the wine to become dark [source: Crosariol].